Reply to thread

Message

<blockquote data-quote="Immacomputer" data-source="post: 2703724" data-attributes="member: 570419">Using only port area and plugging it into that equation will not be as accurate as using winisd. That equation will only really be accurate for round ports.Also, you&#039;re misusing end correction. You do not add end correction to your port length but shorten your port wall to give the effective length.Look at this drawing I made:<img src="http://i15.tinypic.com/29mac6r.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />Let&#039;s say you wanted a port length of 19&quot; for your desired tuning. Some people would make the port wall 19&quot; if they could fit it. If the port was 4&quot; wide, this would actually give an effective port length of 21&quot; and thus lower the tuning.the second image shows how to correctly use end correction. The panel now needs to be 2&quot; shorter to keep the desired tuning frequency and calculated port length of 19&quot;.</blockquote>

[QUOTE="Immacomputer, post: 2703724, member: 570419"] Using only port area and plugging it into that equation will not be as accurate as using winisd. That equation will only really be accurate for round ports. Also, you're misusing end correction. You do not add end correction to your port length but shorten your port wall to give the effective length. Look at this drawing I made: [IMG]http://i15.tinypic.com/29mac6r.png[/IMG] Let's say you wanted a port length of 19" for your desired tuning. Some people would make the port wall 19" if they could fit it. If the port was 4" wide, this would actually give an effective port length of 21" and thus lower the tuning. the second image shows how to correctly use end correction. The panel now needs to be 2" shorter to keep the desired tuning frequency and calculated port length of 19". [/QUOTE]

Verification